Pulley.



R. H. BOWEN.

PULLEY.

APPLICATION FILED AU G. 5, 190a.

Patented July 9, 1912.

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PULLEY. APPLICATIONPILED AUG.5,1908.

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' PULLEY.

APPLICATION FILED AUG. 6, 1908.

Patented July 9;, 1912.

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RUSSELL H. BOWEN, OF PALMYRA, NEW JERSEY, ASSIGNOR TO, THE AMERICANPULLEY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION Oil?PENNSYLVANIA.

PULLEY.

Specification of Letters Patent.

I Patented July 9, 1912 Application filed August 5, 1908. Serial Np.447,040.

and State of New Jersey, have invented certain new and usefulImprovements in Pulleys, whereof the following is a specifica- 'tion,reference being had to the accompanying drawings, in which I have shownmy 1nvention in several forms, the underlying principle, however, beingthe same.

The object of my improvements is to construct with great economy ofmanufacture, a strong and relatively light pulley or sheave, the mainportions of which are formed entirely of sheet metal which can be struckup by means of dies into the desired shapes.

Referring to the drawings, Figure I, represents a side elevation of apulley embodying one form of my invention. Fig. II, is a diametricaltransverse section through the same on the line II, II, of Fig. I. Fig.III, represents a side elevationof a sheave embodying another form of myinvention. Fig. IV, is a diametrical sectional view on the line IV, IV,of Fig. III. Fig. V, represents, in perspective, the dished, or shaped,metallic sheet, of approximately disk form, by means of which the rim ismounted upon the hub, in the type of device shown in Figs. I, and II.Fig. VI, is a similar View in perspective of the metallic sheet used inthe type shown in Figs. III, and IV; the purpose of these twoperspective views being to indicate clearly the details of constructionof the respective sheets.

Referring now to the type shown in Figs. I, II, and V,1, represents thehub of the pulley, 2, the rim thereof, and 3, the metallic sheet ofapproximately disk form by means of which the hub and rim are united.This element 3, which may conveniently be referred to as a disk, isformed from a'flat piece of sheet metal, which is pressed by means ofdies, so as to form dished port-ions 4, 5, 6, 7, 8, and 9, (in thisinstance six in number), projecting alternately on opposite sides ofwhat may be called the neutral plane of the disk itself, which is themedian plane of the completed pulley structure.

The dished portions protrude most deeply at the region nearest to thecenter of the disk and grow shallow as they extend outtance from' theextreme outer periphery. When the pulley is of considerable size, it isdesirable that radial slots 10, should intervene between the proximateedges of the dished portions at the region of greatest depth, in orderto permit the necessary displacement of the metal without risk oftearing. At the inner extremities of each of the dished portions,locking tongues 11, are formed which are bent inward, preferably atrightangles to the neutral plane of thedisk, so as to engage with thehub.

The outer periphery of the disk is slotted radially at intervals, asshown at 12, and the portions of metal intervening between the slots arepressed laterally outward, so as to form flanges which lie in planesparallel to the median plane of the structure, but disward, preferablyvanishing at a short disposed alternately on opposite sides thereof,

as shown at 13, 14, in Fig. V, the flanges 13, being on the side whichis nearest to the observer, while the fianges'14, lie on the sidefarthest from the observer, thus practically constituting a symmetricalchannel whose sides alternate at intervals, but whose central axis liessubstantially in the median plane of the finished pulley.

The sheet 3, may be secured to the hub by casting the latter directlyabout the locking tongues 11, as shown in the sectional view of Fig. II.

The rim 2, of the pulley, consists of bands of sheet steel, each ofwhich is diametrically divided as shown at 19, 20, for convenience ofapplication and each of which has at one edge a rolled bead 15, and atthe other edge an inwardly projecting flange 16. Said flanges fit snuglytogether, and have a total thickness which conforms to the dimensions ofthe channel formed betweenthe alternating flanges 1.3 14, of the sheet2.

The flanges 16, of the rim are secured within this channel by means ofrivets 18, which pass through the flange of the channel at convenientintervals.

In the form shown in Figs. III, IV, and VI, the hub is indicated at 21,the grooved rim at 22, and the intervening disk at 23. Said disk isformed with alternately dished portions 24, 25, 26, 27, 28, and 29,preferably six in number, but as this method of construction is usuallyemployed in a pulley or sheave of relatively small size, no slotsintervene between the adjacentedges of the dished portions, since themetal can flow sufficiently to attain the desired shape without rupture.

' Tongues 30, are formed at the inner extremities of the dishedportions, and the hub may be cast directly around said tongues, as

. before stated. The outer peripher of the disk is pressed laterallyoutward rom the median plane ofthe sheave, so as to form a continuousflange 31, substantially parallel to said plane, and is then bentoutwardly with a curved cross-section, as shown at 32, so as toconstitute one half of the grooved rim of the sheave. The other half 33,of said grooved rim is formed from a se arate piece of metal having thecurved and anged cross section indicated in Fig. IV, the flange 34,being of substantially the same radial depth as the flange 31. The twoflanges are portion of the structure, while the locking tongues firmlyconnect the sheet with the nately on opposite hub whether the latter beformed by casting, as preferred, or in any other manner.

Furthermore, in the most complete embodiment of the invention, thelateral displacement of the outer periphery of the sheet, either whollyto one side of the median plane of the structure as in the type,

in Figs. III, IV, and VI, or altersides of said median plane, as shownin Figs. I,'II, and V, permitsthe location of the rim symmetrically withrelation to said median plane, thereby shown provided symmetrically withrelation to the median affording a maximum of strength with a givenamount of metal. In my claims, I use the term broadly comprehending asheave or similar pulley as I structure, and the term rim ascomprehending the peripheral element, whether the same be plain orgrooved.

Having thus descrlbed my invention, I

claim: 1. The combination with a hub; of a disk with dished portionsalternating plane thereof, said dished portions being provided at theirinner extremities with tongues, projecting at an angle locking thereto,and adapted to engage with the hub; and a rim secured to the outerperiphcry of said disk, substantially as set forth.

f 2. In a pulley, a centrally-apertured sheet metal web formed from adisk provided with dished portions alternating symmetrically withrelation to the median plane thereof, said dished portions beingseparated by radial slots and provided at their inner extremities withlaterally projecting locring tongues adapted to engage with the hu 3.The combination with a hub; of a disk provided with dished portionsalternating symmetrically with relation to its median plane,

and having its outer periphery disposed in alternating flanges onopposite sides of said median plane, said dished portions being providedat their inner ends with means for engaging the hub; and a rim providedwith an internally projecting flange secured between the alternating,

flanges of the disk, substantially as set forth.

In testimony whereof, I have hereunto signed my name, at Philadelphia,Penna, this thirty-first day of July, 1908.

RUSSELL H. BOWEN.

Witnesses ALBERT W. MORRIS, GEORGE THoMAs.

